Steam-boiler furnace



(No Model.) 5 Sheets-Sheet 1.

0. D. ORVIS.

STEAM BOILER PURNACE.

No. 538,274. Patented Apr. so, 1895.

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STEAM BOILER PURNAGE.

No. 538,274. PatentedApr. 30, 1895.

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' O. D. ORVIS.

STEAM BOILBR FURNAGE..

No. 538,274. Patented Apr. 30, 1895.

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(No Model.)

0. D. DEVIS. STEAM BOILBR PURNAGE.

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5 Sheets--Sheet 5. O. D. ORVIS. STEAM BOILER PURNACE.

No. 538,274. Patented A131130, 1895.

bam@ w STATES OREL D. ORVIS, OF

oHIoAeo, ILLINOIS'.

STEAM-BOILER FU RNACE.

SPECIFICATION -forming part of Letters Patent No. 538,274,6.ated April30, 1895.

Application filed July 16, 1894;. Serial No. 517,647. (No model.)

ToaZZ whom, it may concern:

Be it known that I, OREL D.- ORv'Is, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Steam-Boiler Furnaces;and I do declare the following to be a full, clear, and exactdescription of the invention, such as'will enable others skilled in theart to which it appertains to make and use the saine, reference beinghad to the accompanying drawings, and to the letters of reference markedthereon, which form a part of this specification. l

My invention relates to steam boiler furnaces. lts object is toeconomize fuel by securing practically complete combustion; and applyingthe heat to the boiler surface in such manner as to attain highefficiency in steam production. To secure these results, I use twogrates, inclosing each with a low arch from the rear end of which theproducts of combustion are discharged into a combustion` chamber locatedbetween two bridge walls and opening to a iiue below the level of thegrates and extending forwardly and discharging upwardly through a narrowlongitudinal aperture directly u/pon the crown sheet of the boiler.

The invention consists further in various minor details of constructionhereinafter fully described. l

In the accompanying drawings, Figure l is a transverse vertical sectionon the line I 1 of Fig. 3. Fig. 2 is a plan section taken immediatelybelow the boiler. Fig. 3 is a longitudinal vertical section on the line3 3 of Fig. 2, the boiler being in elevation. Fig. 4 is a similar viewon the line 4 4 of Fig. 2. Fig. 5 is a transverse vertical section onthe line 5 5 of Fig. 3, and Fig. 6 is a transverse vertical section ofthe flue below the grates showing one form of construction..

Essential to the complete combustion of the iniiammable gases set freeby the initial combustion of the fuel is the maintenance of a hightemperaturevuntil'the desired result is attained. Contact of the gaseswith water surfaces must be avoided, and hence the most commonconstruction of smoke-burning furnaces leaves the forward portion of theboiler to be heated through masonry, the gases being led back throughcombustion fines until complete iniiammation has been accomplished. Y

In the furnace forming the subject of this application, I have attainedcomplete combustion while throwing the hot vapor resulting therefromupon the forward end of the boiler, and carrying it thence alongits-entire length.

I show in the drawings the ordinary front Space being provided betweenitand the arch.

Between the two bridge walls, D, F, there is a combustion chamber, d,extending downwardly and opening forwardly through the wall, D, into aflue, G, below the level of the grates, and extending forwardly to thefront wall, A, and having a narrow longitudinal opening along its upperside through which the products of combustion make their exit, passingupwardly between two arches, E, E, and being delivered directly upon thecrown sheet of the boiler, B, and carried back over the bridge wall, F.Upon the top of the wall, D, I place some fire-brick, h, spaced apart sothat the carbonio oxide circulates among them and they become highlyheated. The flue, G,

terminates atthe rearward side of the wall,

D, and a plate, H, closes the .space between the two arches, E, E, fromthat line back to the face of the wall, F, so that the smoke is forceddown to the mouth of the flue, G.

The flue, G, is shown in Figs. 1, 2, 3, ande as a steel water shell,having its edges, g, g, upturned and prolonged in parallel planes to thealtitude of the bridge wall,D. A service pipe, K; leads from .the bottomof the boiler, B, at its rearward end and enters this water shell at itsrearward end and at its lowest point. Two return pipes, L, L, lead fromthe top of the forward end of its upturned edges, g, g, to the boiler,so that provision is made for free and rapid circulation.

IOO

If desired the iiue may be of masonry as shown at G', in Fig. 6, andmetal sheath, g', may be used to bind it together.

The discharge aperture of the flue, G, is so narrow that the draft iscarried throughout its length. To insure this result the. rearwardportion of this aperture may be closed in part by brick, as h', h',spaced apart.

Combustion is complete in the chamber, d, where the two currents meetdirectly below the plate, H, so that the temperature within the iiue, G,is very high and the development of steam in the water shell formingitsY walls is very rapid.

The minor features of the furnace shown but not already described arethe T-beams, E, running from the wall, A, to the wall, F, for supportingthe inner ends of the arches, E, their outer ends being set inthe walls,A', A; the feed pipe, lo, entering the service pipe, K, and thefpipes,Z, l, l, leading forwardl from the water shell andproviding means forcleaning it.

This furnace is of especial value for the consumption of anthracitecoal. The low arches, E, E, become highly heated and the inflammation ofthe carbonic oxide continues, showing a blue flame, from the front. ofthe fire-boxes through 4the passages over the bridge-wall, D, theinliammable gases being entirely burned before reaching the watersurface of the flue, G.

I claim as my inventionl. In a steam boiler furnace, the combina.- tionwith the inclosing walls, a pair of gra-tes and with a bridge wall, F,of an arch cover ing each grate from the front wall of the furnace tothe bridge wall, F, and forming therewith a fire boX, a flue leadingforwardly from the bridge-wall and being in communication i with thetire boxes, such tiue being located below the tire-boxes and openingupwardly b etween the arches, substantially as described and for thepurpose set forth.

2. In a steam boiler furnace the combination with a pair of inclosedlire-boxes and with a steam boiler located above the fireboxes, of aflue located between the fireboxes and leading from the rearward endthereof and having a discharge opening along its upper side, whereby theproducts of combustion are delivered against the forward portion of theboiler, substantially as described. and for the purpose set forth.

3. In a steam boiler furnace the combination with inclosed fire-boxes,of a masonry inclosed combustion chamber at the rear of the fire-boxesand open thereto, and a fiue leading forwardly from such chamber andhaving a discharge opening along its upper side, substantially asdescribed.

4. In a steam boiler furnace the combination with the boiler, a pair offire-boxes and their grates, a solid arch inclosing each firebox, and abridge-Wall, F, closing the rearward end of such arches, ofabridge-wall, D, located forward of the wall F and forming therewith aAcombustion chamber' extending below the level of the grates, and a fluelocated below the grates and leading forwardly from the combustionchamber and having a discharge opening along its -upper side,substantially as described.

5. In a steam boiler furnace the combination with the boiler, a `pair offire-boxes and their grates, a solid arch inclosiug each firebox, and abridge-wall, F, closing the rearward end of such arches, of abridge-wall, D, lo-

cated forward of the wall F and forming therewith a combustion chamberextending below the level of the grates, a flue located below the gratesand leading forwardly from the combustion chamber and having a dischargeopen-ing along its upper side, the walls of such flue being a Watershell, and water pipes connecting such water shellwith the boilcr,.substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

OREL D. ORVIS.

Witnesses:

LOUIS K. GILLsoN, SPENCER WARD.

